Zinc sulfide nanoparticles: Spectral properties and photocatalytic activity in metals reduction reactions |
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Authors: | A L Stroyuk A E Raevskaya A V Korzhak S Y Kuchmii |
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Institution: | (1) Photochemistry department, Pisarzhevski Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Nauky av., 03028 Kiev, Ukraine |
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Abstract: | Formation of zinc sulfide nanocrystals in aqueous solutions of various polymers has been studied. Spectral properties of ZnS
nanoparticles have been investigated, the structure of the long-wave edge of the fundamental absorption band of ZnS nanocrystals
has been analyzed. It has been shown that the variation of the synthesis conditions (stabilizer nature and concentration,
solution viscosity, ZnS concentration, etc.) allows tailoring of the ZnS nanocrystals size in the range of 3–10 nm.
Photochemical processes in colloidal ZnS solutions, containing zinc chloride and sodium sulfite, have been investigated. It
has been found that the irradiation of such solutions results in the reduction of Zn(II), the rate of this reaction growing
at a decrease in the size of ZnS nanoparticles. Kinetics of photocatalytic Zn(II) reduction has been studied. It has been
concluded that two-electron reduction of adsorbed Zn(II) species is the rate-determining stage of this reaction.
Photocatalytic activity of ZnS nanoparticles in KAu(CN)2 reduction in aqueous solutions has been discovered. Spectral characteristics and kinetics of ZnS/Au0 nanocomposite formation have been studied. It has been shown that the photoreduction of gold(I) complex is the equilibrium
reaction due to the reverse oxidation of gold nanoparticles by ZnS valence band holes. |
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Keywords: | ZnS nanoparticles quantum confinement semiconductor photocatalysis metal-semiconductor nanocomposites zinc reduction gold nanoparticles plasmon resonance |
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